mrmooseb SE
Joined: 16 Jun 2008
Posts: 9
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| 99 monte |
Posted: Wed Jul 30, 2008 5:10 pm |
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sorry took so long to reply, changed intake gaskets including a new upper plennum and pcv has different throttle body w/ sensors and still have same issue......HATE THIS CAR... just don't know any more |
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streetracer Site Admin

Joined: 18 Sep 2005
Posts: 933
My Vehicles: 1998 Pontiac Grand Prix GTP |
| (No subject) |
Posted: Wed Aug 13, 2008 9:59 am |
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What are the problems now? |
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mrmooseb SE
Joined: 16 Jun 2008
Posts: 9
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| Re: 99 monte |
Posted: Mon Oct 06, 2008 7:58 pm |
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same problems, hesitates at speed, dies at start up, after car is warm it will die when you come to a stop. 45psi fuel pressure 17hg vaccuum at idle...stap throttle drops to 0 and comes right back to 17 needle steady.... at start a hissing sound inter. from the left front almost like a large vaccuum leak then it just goes away car runs fine until it warms. GM tech line called and the are no help....evap? vaccuum? only code is P0102 MAF sensor, replaced MAF....I am lost |
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streetracer Site Admin

Joined: 18 Sep 2005
Posts: 933
My Vehicles: 1998 Pontiac Grand Prix GTP |
| (No subject) |
Posted: Wed Oct 08, 2008 2:43 pm |
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And you have double checked that the vacum line from the fuel pressure regulator, to the intake to the back evap purge soloniod is fine?
Also your in a monty, did you take off your throttle valve and make sure the gasket isnt leaking antifreeze? |
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mrmooseb SE
Joined: 16 Jun 2008
Posts: 9
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| Re: 99 monte |
Posted: Wed Oct 08, 2008 3:13 pm |
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yes checked lines a dozen times, have not checked throttle valve....thanks for the time, started calling the car christine...going to kill me (lol) will let you know about valve.....low coolant light is on inter. have any thing to do with it |
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mrmooseb SE
Joined: 16 Jun 2008
Posts: 9
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| Re: 99 monte |
Posted: Fri Nov 07, 2008 7:12 pm |
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no luck car still the same looking to buy new....which sucks since we love the car...thanks for all the time and help |
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brad360 GT

Joined: 17 May 2006
Posts: 64 Location: maine
My Vehicles: 1999 Pontiac Grand Prix SE |
| Re: 99 monte |
Posted: Sun Aug 02, 2009 6:24 pm |
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This may sound stupid, but you said you replaced the MAF and you have the MAF code? Are the wires to the MAF in good shape? rubbing or chaffing on anything?? ITs good to be back!!!!!!! |
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